chore(deps): update dependency google-api-python-client to v1.9.1 [(#3930)](GoogleCloudPlatform/python-docs-samples#3930)

Author: renovate-bot

samples/snippets/api/requirements.txt

@@ -1,3 +1,3 @@
-google-api-python-client==1.8.4
+google-api-python-client==1.9.1
 google-auth==1.16.0
 google-auth-httplib2==0.0.3